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Re: [OM] Comparing 50 mm lenses

Subject: Re: [OM] Comparing 50 mm lenses
From: "C.H.Ling" <ch_photo@xxxxxxxxxxxxx>
Date: Mon, 21 Nov 2011 13:31:42 +0800
To me the only way to conclude color rendering is to use well controlled 
lighting. Window light can change with time. For the Tamrons I have tested 
(SP 35-80 and SP 24-48), they have slightly green cast. The Olympus? It is 
always beautiful :-)

C.H.Ling

----- Original Message ----- 
From: "Moose" <olymoose@xxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Monday, November 21, 2011 12:31 PM
Subject: Re: [OM] Comparing 50 mm lenses


> OK, I've read all the comments and looked carefully at the images again.
>
> As I said, I processed them all to have the histogram just kiss the top, 
> ETTR. In that sense, the differences in
> midrange brightness reflects real differences in the lenses. but I can see 
> how those differences make comparing other
> aspects difficult.
>
> So I adjusted the darker Oly and lighter Zeiss to match the Tamron in 
> average brightness.
> <cid:part1.06030600.06090502@gmail.com>
>
> The differences in the histograms with only changing the lenses, are 
> greater than I would have expected. Color
> differences I expected. Such large differences in the position of the main 
> portion of the histogram relative to top and
> bottom is a surprise.
>
> I've revised the original roll-over to use the average brightness matched 
> versions.
> <http://www.moosemystic.net/Gallery/tech/Lenses/50mm_lenses/50mmcomp.htm>
>
> I looked more closely at focus, and it's apparent that I mis-focused the 
> Tessar slightly further back than the other
> two. So I've done a half decent PP job of moving the focal plane forward 
> to match the others. Again, this is to allow
> comparison of others aspects without an extraneous factor interfering.
>
> BTW, after some study at 100%, I still don't think these shots can say 
> which is sharpest overall. The Tessar is quite
> sharp on the dark red flowers on the left, where the other two are softer, 
> and softer than the others in the forward
> dahlia petals.
>
> Now we come down to color. The Tessar seems to me to be doing something 
> magical in the subtle colors of the petals of
> the central flower. But the overall color of the Zuiko is so different 
> that it's hard to compare them. I did a color
> matching of Zuiko to Tessar, first the whole image, then overlaid a masked 
> color match of the central bloom.
>
> With the colors much closer, it's easy to see that the Tessar is doing 
> something special in the subtle colors of the
> petals. The Zuiko seems flatter, with the Tamron in between. Which is more 
> accurate is impossible to say, although I
> tend to agree with Marnie that it may be the Tamron.
>
> Accurate or not, I think the Tessar's rendering of those colors is most 
> attractive to my eye. If I were shooting a bunch
> of flowers as a project, I'd use the Tessar, for a little bit of extra 
> magic.
>
> Moose
> -- 
> What if the Hokey Pokey *IS* what it's all about?
> -- 

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